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United States Patent |
5,074,468
|
Yamamoto
,   et al.
|
December 24, 1991
|
Automatic water sprinkler control system
Abstract
An automatic control system, having a main control system with wireless
communication equipment, with a water sprinkling device disposed in an
area to be sprinkled with water and adapted to sprinkle water over this
area, and water piping installed between a water source and the water
sprinkling device, and adapted to distribute water from the water source
to the water sprinkling device. A water sprinkling control system is
installed on the ground in a position close to the water sprinkling device
and adapted to control the water sprinkling device. The water sprinkling
control system includes a hydraulic valve disposed in the water piping
close to the sprinkling device which has a water channel connecting an
inflow passageway with a flow passageway connected to a pilot line. A
two-way pilot solenoid valve is connected at one port thereof to the
hydraulic valve through the pilot line, and at the other port to a drain
piping. The water sprinkling control system also has a wireless signal
receiving-transmitting system which receives a control signal from the
main control system and transmits an answer signal thereto, a solenoid
valve control device disposed in the vicinity of the two-way pilot
solenoid valve, connected to the wireless signal receiving-transmitting
device to control the two-way pilot solenoid valve, and a power supply
which supplies electric power to the wireless signal
receiving-transmitting device and the solenoid valve device.
Inventors:
|
Yamamoto; Harushi (Osaka, JP);
Otsuka; Naoki (Nishinomiya, JP)
|
Assignee:
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Sekisui Koji Kabushiki Kaisha (Osaka, JP);
Konan Denki Kabushiki Kaisha (Nishinomya, JP)
|
Appl. No.:
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474038 |
Filed:
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April 17, 1990 |
PCT Filed:
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August 28, 1989
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PCT NO:
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PCT/JP89/00874
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371 Date:
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April 17, 1990
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102(e) Date:
|
April 17, 1990
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PCT PUB.NO.:
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WO90/01868 |
PCT PUB. Date:
|
March 8, 1990 |
Foreign Application Priority Data
| Aug 29, 1988[JP] | 63-214491 |
Current U.S. Class: |
239/69; 239/70; 239/201; 251/30.02 |
Intern'l Class: |
B05B 012/00; A01G 025/16 |
Field of Search: |
239/66,69,70,200,201,207
251/30.01,30.02
|
References Cited
U.S. Patent Documents
3000398 | Sep., 1961 | Link | 239/70.
|
3372899 | Mar., 1968 | McPherson | 251/30.
|
3386460 | Jun., 1968 | Dean | 239/70.
|
3791619 | Feb., 1974 | Pett | 251/30.
|
3913884 | Oct., 1975 | Rolfe | 251/30.
|
4603832 | Aug., 1986 | Sjoquist | 251/30.
|
4852802 | Aug., 1989 | Iggulden et al. | 239/70.
|
Foreign Patent Documents |
16861/47 | Nov., 1950 | AU.
| |
33596/71 | Oct., 1974 | AU.
| |
54743/73 | Feb., 1976 | AU.
| |
66585/74 | Apr., 1978 | AU.
| |
42410/78 | Jun., 1980 | AU.
| |
50145/79 | Dec., 1982 | AU.
| |
53278/79 | May., 1984 | AU.
| |
59621/80 | Sep., 1984 | AU.
| |
31646/84 | Aug., 1987 | AU.
| |
2707219 | Jan., 1979 | DE.
| |
2836415 | Mar., 1979 | DE.
| |
Primary Examiner: Kashnikow; Andres
Assistant Examiner: Merritt; Karen B.
Attorney, Agent or Firm: Armstrong, Nikaido, Marmelstein, Kubovcik & Murray
Claims
We claim:
1. An automatic water sprinkler control system comprising:
a main control means having a wireless communications equipment;
at least one water sprinkling means disposed in an area to be sprinkled
with water and adapted to sprinkle water over said area;
a water piping installed between a water source and said water sprinkling
means and adapted to distribute water from said water source to said water
sprinkling means; and
a water sprinkling control means installed on the ground in a position
close to said water sprinkling means and adapted to control said water
sprinkling means, said water sprinkling control means comprising:
a) a hydraulic valve disposed in said water piping in a position close to
said water sprinkling means, said hydraulic valve having a diaphragm which
can be opened and closed, said diaphragm including a small diameter
passageway formed in a flexible portion thereof connecting an inflow
passageway of the hydraulic valve to a flow passageway connected to a
pilot line;
b) a two-way pilot solenoid valve connected at one port thereof to said
hydraulic valve through said pilot line and at the other port to a drain
piping and adapted to control said hydraulic valve;
c) a wireless signal receiving-transmitting means adapted to receive a
control signal from said main control means and to transmit an answer
signal to said main control means;
d) a solenoid valve control means which is disposed in the vicinity of said
two-way pilot solenoid valve, connected to said wireless signal
receiving-transmitting means and adapted to control said two-way pilot
solenoid valve according to said control signal received by said wireless
signal receiving means; and
e) a power supply means for supplying electric power to said wireless
signal receiving-transmitting means and said solenoid valve means.
2. An automatic control system, comprising:
a main control means having a wireless communication equipment;
at least one water sprinkling means disposed in an area to be sprinkled
with water and adapted to sprinkle water over said area;
a water piping installed between a water source and said water sprinkling
means, and adapted to distribute water from said water source to said
water sprinkling means; and
a water sprinkling control means installed on the ground in a position
close to said water sprinkling means and adapted to control said water
sprinkling means, said water sprinkling control means comprising;
a) a hydraulic valve disposed in said water piping in a position close to
said sprinkling means, said hydraulic valve having a water channel
connecting an inflow passageway of the valve with a flow passageway to
which a pilot line is connected, said water channel being provided with an
air bleeding orifice which can be opened and closed with respect to the
atmosphere;
b) a two-way pilot solenoid valve connected at one port thereof to said
hydraulic valve through said pilot line, and at the other port to a drain
piping and adapted to control said hydraulic valve,
c) a wireless signal receiving-transmitting means adapted to receive a
control signal from said main control means and to transmit an answer
signal to said main control means,
d) a solenoid valve control means which is disposed in the vicinity of said
two-way pilot solenoid valve, connected to said wireless signal
receiving-transmitting means and adapted to control said two-way pilot
solenoid valve according to said control signal received by said wireless
signal receiving means, and
e) a power supply means for supplying electric power to said wireless
signal receiving-transmitting means and said solenoid valve means.
Description
TECHNICAL FIELD
The present invention relates to an automatic water sprinkler control
system to be used in comparatively large areas such as farm lands
including orchards and truck farms, golf courses and so on.
BACKGROUND ART
The hitherto-known system of this type comprises a multiplicity of water
sprinkling means such as sprinklers disposed in strategical positions,
water pipes disposed in or on the ground and connecting said water
sprinkling means with a valve means equipped with a solenoid valve built
into the water pipe in a position close to each of said water sprinkling
means and a control wiring buried underground between said valve means and
a control board installed in a control room or the like, with said valve
means being opened and closed from said control board.
However, since the control wiring is buried underground in the above
conventional system, there is the problem that when water lines are
installed in the ground alongside the control wiring, the control wiring
is sometimes damaged during the maintenance of the water lines. Moreover,
in the case of a golf course, since the control wiring generally extends
several kilometers, voltage drops and insulation failures tend to occur
and there is consequently the additional drawback that a thunderbolt
falling nearby damages the control wiring. Furthermore, when the control
wiring is affected by a thunderbolt or other cause, it is very difficult
to locate the point of damage because of underground installation so that
much time and labor are involved in inspection and repair work.
Developed to overcome the above-mentioned drawbacks of the conventional
system, the present invention has as its object to provide an automatic
water sprinkler control system which does not require an extensive control
wiring and, hence, is completely free from the risk of damage to the
wiring which is associated with the maintenance of water piping and, also,
from the risk of malfunctioning of control valves which is associated with
such damages.
It is a further object of the present invention to provide a system which
requires only a short installation time and a short time for additional
work if such work becomes necessary after initial installation, and
involves little earth-moving work, thus being suitable for installations,
such as golf courses, where damages to the ground surface are serious
problems.
It is a still further object of the present invention to provide a system
wherein the control valves can be operated positively and accurately even
if air or dust enters into the pipeline.
DISCLOSURE OF THE INVENTION
The present invention relates to an automatic water sprinkler control
system comprising a main control means having a wireless communications
equipment, one or more water sprinkling means installed in an area to be
sprinkled with water and adapted to sprinkle water over said area, a water
piping installed on or in the ground between a water source and said water
sprinkling means and adapted to distribute water from said water source to
said water sprinkling means, and a water sprinkling control means
installed on the ground in a position close to said water sprinkling means
and adapted to control said water sprinkling means, said water sprilkling
control means comprising hydraulic valve disposed in said water piping in
a position close to said water sprilkling means, a two-way pilot solenoid
valve connected at one port thereof to said hydraulic valve through a
pilot line and at the other port to a drain piping and adapted to control
said two-way pilot solenoid valve, a wireless signal
receiving-transmitting means adapted to receive a control signal from said
main control means and to transmit an answer signal to said main control
means, a solenoid valve control means which is disposed in the vicinity of
said two-way pilot solenoid valve, connected to said wireless signal
receiving-transmitting means and adapted to control said two-way pilot
solenoid valve according to said control signal received by said wireless
signal receiving means, and a power supply means for supplying electric
power to said wireless signal receiving-transmitting means and said
solenoid valve means.
In the automatic water sprinkler control system of the present invention
which includes no control wiring other than the lead wire between the
solenoid valve control means and two-way pilot solenoid valve and the
hydraulic valve is controlled by the two-way pilot solenoid valve
connected thereto through said pilot line, there is no trouble of the
control wiring being damaged during maintenance of water piping and the
possibility of the system attracting a lightening accident is also low.
Moreover, even if the electrical system is struck and damaged by lightning,
restoration work is simple because no excavation work is necessary.
Furthermore, since the lead wire between the solenoid valve control means
and two-way pilot solenoid valve is the only control wiring present and,
moreover, is not buried underground, the installation time can be very
brief. Furthermore, since the water sprinkler control means is installed
on the ground, even if a need arises for additional work after
installation for adjustment or confirmation of sprinkling amount, for
instance, the work does not take much time, nor is it necessary to
excavate the ground. Therefore, the system can be used advantageously in
such installations as golf courses where the ground surface should not be
damaged.
Moreover, even if there is an entry of air in the two-way pilot solenoid
valve and in pilot line for controlling the hydraulic valve, the air is
readily exhausted through the drain line connected to the two-way pilot
solenoid valve. As a result, it does not happen that the response of the
hydraulic valve is decreased, nor does a water hammer or the like take
place, so that the reliability of the system as a whole is high.
Furthermore, the hydraulic valve has a diaphragm and is opened and closed
by this diaphragm. When this diaphragm is provided with a small-diameter
passageway connecting the inflow passageway of said hydraulic valve with
the passageway to which said pilot line is connected, the dust which may
happen to be caught in the small-diameter passageway is easily dislodged
by the motion of the diaphragm so that the passageway is not easily
clogged and the possibility of troubles due to dust is reduced. Moreover,
when the hydraulic valve is provided with a water channel connecting the
inflow passageway with the flow passageway to which said pilot line is
connected, with said water channel being provided with an air bleeding
orifice which can be opened and closed with respect to the atmosphere, the
above removal of air is easily performed by this air bleeding orifice.
Furthermore, when a two-position acting valve is used as said two-way
solenoid valve, the control signal for controlling the solenoid valve can
be a pulse signal and in this case it is not necessary to continuously
supply electric energy to the solenoid valve so that the capacity of the
power supply can be as much reduced to contribute to the conservation of
energy.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view illustrating an automatic water sprinkler
control system embodying the principle of the present invention;
FIG. 2 is a sectional elevation view showing an example of the hydraulic
valve used in the present invention;
FIG. 3 is an exploded perspective views of the same valve;
FIG. 4 is a sectional view illustrating another example of the hydraulic
valve used in the present invention; and
FIG. 5 is a sectional elevation view showing still another example of the
hydraulic valve used in the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention is described in further detail, reference being had
to the accompanying drawings.
The automatic water sprinkler control system of the present invention
comprises a main controller 1 as a main control means equipped with a
wireless communications equipment 11, one or more water sprinkling means
2, for example sprinklers, which are disposed in an area to be sprinkled
with water and adapted to sprinkle the area, a water line 3 which is
buried in the ground between a water source (not shown) and said
sprinkling means 2 and adapted to supply the sprinkling means 2 with water
from said water source, and a sprinkler controller 4 which is disposed on
the ground in the vicinity of said sprinkling means 2 and adapted to
control the sprinkling means 2. The controller 4 comprises a hydraulic
valve 41 disposed within said water line 3 in a position close to said
sprinkling means 2, a two-way solenoid pilot valve 44, one port of which
communicates with said hydraulic valve 41 through a pilot line 42, with
the other port communicating with a water drain line 43, and which is
adapted to control said hydraulic valve 41, a wireless signal
receiver-transmitter 45 adapted to receive a control signal transmitted
from said main controller 1 and to transmit an answer signal to said main
controller 1, a solenoid valve controller 46 which is disposed in a
position close to said two-way pilot solenoid valve 44 and connected to
said signal receiver-transmitter 45 so as to control said two-way pilot
solenoid valve 44 according to the control signal received by said signal
receiver-transmitter 45, and a battery 47, which may comprise a solar cell
40, as a power source for said signal receiver-transmitter 45 and solenoid
valve controller 46.
Referring to FIG. 1, the reference numeral 5 represents a wireless relay
which is installed when the system of the present invention is used in
cases where a large tract of land is to be sprinkled or the landscape
interferes with the propagation of electric signals. In this sense, the
wireless relay 5 is not an indispensable unit.
The main controller 1 mentioned above is a unit for controlling the whole
system and is generally installed in a control house or room. This
controller 1 is equipped with a computer 12 in addition to said wireless
communications equipment 11 and the required control data inclusive of
sprinkling start and stop time data as inputted or previously stored in
the computer 12 are transmitted from the wireless communications equipment
11.
Referring to the sprinkling means 2 mentioned above, tens to hundreds of
units are generally installed taking a golf course as an example. It
should be understood that the water sprinkling means to be used in the
present invention need not be a sprinkler as such but may be a simple
water delivery nozzle.
The aforementioned hydraulic valve 41 is installed in the water line 3 in a
position close to the sprinkling means 2 for controlling the supply of
water to the sprinkling means 2.
While this hydraulic valve 41 may be of an optional design only if the
valve may be opened and closed by utilizing changes in the pressure of
water, the valves shown in FIGS. 2 to 5 are preferably used.
Thus, the hydraulic valve 41 illustrated in any of FIGS. 2 and 3 comprises
an open-top body 413 having a dividing wall 410 defining an inflow
passageway 411 and an outflow passageway 412, an internal cavity 414
communicating with said inflow and outflow passageways 411, 412 and a
pilot line coupling 415, a bonnet 416 mounted so as to cover the top
opening of the body 413, a diaphragm 417 interposed between the body 413
and the bonnet 416 so as to block the top opening, an O-ring 418
interposed between the bottom periphery of said diaphragm 417 and the top
periphery of said body 413, and a spring 419 interposed between said
diaphragm 417 and said bonnet 416 and preenergizing said diaphragm 417
against the top opening of body 413, said diaphragm 417 having a
small-diameter passageway 420 in a position adjacent to the inflow
passageway 411 of body 413 so that the inflow passageway 411 of body 413
is communicating with the pilot line coupling 415 through said
small-diameter passageway 420.
In the hydraulic valve 41 illustrated in FIG. 4, a water channel 421
connecting said inflow passageway 411 with said pilot line coupling 415 is
formed through the body 413 and bonnet 416 in lieu of said small-diameter
passageway 420 in said diaphragm 417 in the above embodiment.
The hydraulic valve 41 illustrated in FIG. 5 is such that the bonnet 416
shown in FIG. 4 is provided with a water channel 421 and an air bleeding
orifice 422.
Of whichever of the above constructions, the hydraulic valve 41 is such
that its inflow passageway 411 communicates with the pilot line coupling
415 at all times and when the two-way pilot solenoid valve 44 connected to
the pilot line 42 is in open position, the water in the inflow passageway
411 flows into the pilot line coupling 415 through said passageway 420 or
water channel 421 and is discharged from the drain line 43 connected to
the two-way pilot solenoid valve 44. Therefore, in this condition the
hydraulic pressure in the pilot line 42 and the cavity 414 of the bonnet
416 of the hydraulic valve 41 is substantially nil, with the result that
the diaphragm 417 is pushed by water pressure toward the bonnet 416
overcoming the resilient biasing force of said spring 419. In consequence,
the inflow passageway 411 is brought into communication with the outflow
passageway 412 so that the water flows from the inflow passageway 411 to
the outflow passageway 412. On the contrary, when the two-way pilot
solenoid valve 44 is in closed position, there is no drainage of water
from the drain line 43 connected to the solenoid valve 44 so that the
hydraulic pressure within the pilot line 42 and the internal cavity 414 of
bonnet 416 is increased. As a consequence, the diaphragm 417 is pushed
toward the body 413 to block the communication between the inflow
passageway 411 and outflow passageway 412. While the above open-and-close
operation is repeated, the pilot line 42 is full of water at all times.
The above-mentioned pilot solenoid valve is a valve operated by a solenoid.
This solenoid valve 44 is connected, at one end thereof, to said pilot
line 42 and, at the other end, to the drain line 43. The free end of the
drain line 43 discharges into a drain gutter or the ground. The two-way
pilot solenoid valve 44 is installed on the ground or in a box set at
ground level.
The solenoid valve controller 46 mentioned hereinbefore controls the
open-and-close operation of the two-way pilot solenoid valve 44. This
solenoid valve controller 46 is disposed near said two-way pilot solenoid
valve 44 and connected thereto through a lead wire 48. The lead wire 48 is
preferably as short as possible.
The operation of the automatic water sprinkler control system of the
present invention is explained below.
As a control signal instructing the sprinkling of water is transmitted from
the wireless communications equipment 11 of the main controller 1, this
signal is relayed by the relay 5 and received by an antenna 49 of the
signal receiver-transmitter 45 of the sprinkler controller 4. The relay 5
receiving a station group code transmits a similar control signal to the
sprinkler controller 4 within the corresponding group.
Having received the above-mentioned control signal, the solenoid valve
controller 46 feeds an electric current according to the control signal to
the two-way pilot solenoid valve 44 via the lead wire 48. Thereupon the
two-way pilot solenoid valve 44 is opened. Then, the water in the pilot
line 42 is drained from the drain line 43 via the solenoid valve 44 so
that the hydraulic pressure in the pilot line 42 and the internal cavity
414 of the bonnet 416 of the hydraulic valve 41 is substantially reduced
to zero. Consequently, the diaphragm 417 is pushed by the hydraulic
pressure toward the bonnet 416 against the residency of the spring 419. As
a result, the inflow passageway 411 is brought into communication with the
outflow passageway 412 and the water flows from the inflow passageway 411
to the outflow passageway 412 so that the water is delivered from the
sprinkler 2. Then, the wireless receiver-transmitter 45 transmits an
answer signal indicating the start of water sprinkling to the main
controller 1. If something is wrong with the two-way pilot solenoid valve
44 and/or the hydraulic valve 41, the wireless receiver-transmitter 4
transmits an answer signal indicating the valve trouble to the main
controller 1.
When a control signal instructing the stop of water sprinkling is
transmitted from the main controller 1 and received by the antenna 49 of
the signal receiver 45, the solenoid valve controller 46 arrests the flow
of an electric current to the two-way pilot solenoid valve 44 to close the
solenoid valve 44. Thereupon the drain of water from the drain line 43
connected to the solenoid valve 44 stops and the hydraulic pressure in the
pilot line 42 and the internal cavity 414 of the bonnet 416 is increased.
As a result, the diaphragm 417 is pressed toward the body 413 and the
inflow passageway 411 is secluded from the outflow passageway 412 again,
whereby the sprinkling of water from the sprinkler 2 is suspended. Then,
the wireless receiver-transmitter 45 transmits an answer signal indicating
the stop of water sprinkling to the main controller 1.
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